Since the game can already differentiate between lower face scars/beards etc and head hairstyle, allow us to combine open face helmets/headwraps/goggles with lower face cosmetics like bandanas etc.
This would add customization options and would make lazy helmet recolours which are all open face, interesting since you would be able to customize them with lower face cosmetics.
It doens’t necessarly have to be a perfect match between hairstyle and hood, but having the hood able to adapt to long hair, short hair and no hair with the right color would go a long way and only require two small variations.
I don’t like my psyker going suddenly bald every time I use the cawl